Check if a string has 20 numbers in a row in it

My code will check if the variable myString has 20 running numbers. I'm new to JavaScript and I'm wondering if there is a simpler way to do this. How can I shorten my code and possibly make it more efficient?

var myString = "tuxwuhkocx14789470019215498263ljmgwsxvne";
var runningNumbers = 0;

for (i = 0; i < myString.length; i++) {

    var character = myString.charAt(i);

    if (!isNaN(character)) {
        // If character is a number:
        runningNumbers = runningNumbers + 1;
    } else {
        // If character is NOT a number:
        runningNumbers = 0;
    }

    if (runningNumbers == 20) {
        console.log("myString has 20 running numbers.");
    }

}

Output:


myString has 20 running numbers.

If you use a regular expression to look for 20 digit characters (\d) in a row, then the code would be compact and the goal would be visible at a glance:

var twentyDigits = /\d{20}/;
if (twentyDigits.test(myString)){
  console.log("My string has 20 running numbers");
}

You can shorten this further as just:

if (/\d{20}/.test(myString)) console.log("Yup. 20");

StackExchange Code Review Q#120374, answer score: 31